Introduction to the Security Service
MI5's mission is to keep the country safe. For more than a century we have worked to protect the UK from a range of threats, whether it be from terrorism or hostile activity by states.
In an era of technological change, we must constantly innovate to protect the country from harm.
MI5 expects all staff to uphold the Rule of Law and maintain the highest standards of integrity.
Working closely with GCHQ, SIS and the police, we protect our society and economic prosperity.
For more than a century MI5 has continuously adapted to counter the changing threats.
We are proud of our enduring values of teamwork and professionalism.
